हँसाई (Hindi) comes from Hindi हँसना, from Sauraseni Prakrit 𑀳𑀲𑀤𑀺, from Sanskrit हसति, from Sanskrit शाला, from Proto-Indo-European ḱel-eh₂, from Proto-Indo-European ḱel- — to cover; to incline.
हँसाई (Hindi): laughing, laughter; fun